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A New NOx Reduction Catalyst System for Diesel Engine with High Sulfur Tolerance
Technical Paper
2003-01-3241
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A new concept of highly efficient and sulfur tolerant NOx reduction catalyst for diesel engines has been demonstrated. This catalyst has a double-layer construction and is composed of Pt and Rh as the precious metals, oxygen storage materials and some other catalytic components. Periodic lean/rich operation similar to the Lean NOx Trap catalyst was found to improve the highly efficient NOx reduction activity in a laboratory reactor test. As a result, this catalyst has the feature of high NOx reduction in a temperature window from 15°C to 35°C, and of high oxidation activity even in a lower temperature condition for HC and CO. Sulfur poisoning characteristics were also evaluated in a laboratory reactor test. The results showed that the proper desulfation procedure with a relatively low temperature environment enabled the stored sulfur to be reomved, and to maintain the NOx reduction efficiency for asignificantly long time period.
In an application of this catalyst to HSDI diesel engines for passenger vehicle, the results of NOx reduction efficiency were demonstrated to be over 80% in steady state conditions under the periodic rich combustion operation. The sulfur tolerance in an actual diesel engine exhaust gas was also evaluated under the condition of using 50ppm and 350ppm sulfur diesel fuel. When applying a suitable rich combustion of the diesel engine, even after poisoning with 350ppm sulfur fuel for a good while, it was possible to remove the stored sulfur and have no deterioration of NOx conversion efficiency.
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Authors
- Taiji Uekusa - Isuzu Advanced Engineering Center
- Kazuhiro Enoki - Isuzu Advanced Engineering Center
- Tetsuya Fujita - Isuzu Advanced Engineering Center
- Yousuke Tanaka - Isuzu Advanced Engineering Center
- Hiromi Shibuya - Isuzu Advanced Engineering Center
- Teruo Nakada - Isuzu Advanced Engineering Center
Topic
Citation
Uekusa, T., Enoki, K., Fujita, T., Tanaka, Y. et al., "A New NOx Reduction Catalyst System for Diesel Engine with High Sulfur Tolerance," SAE Technical Paper 2003-01-3241, 2003, https://doi.org/10.4271/2003-01-3241.Also In
Emissions: Advanced Catalyst and Substrates, Measurement and Testing, Diesel Gaseous Emissions
Number: SP-1801; Published: 2003-10-31
Number: SP-1801; Published: 2003-10-31
References
- Johnson Timothy V. “Diesel Emission Control in review - The Last 12 Months” SAE 2003-01-0039
- Rusch Klaus et al. “PM-Reduction by SCR-Catalyst” SAE203-01-0777
- Liu Z. Gerald et al. “Diesel Particulate Filters: Trends and Implications of Particle Size Distribution Measurement” SAE 2003-01-0046
- Hoard John “Plasma-Catalysis for Diesel Exhaust Treatment: Current State of the Art” SAE 2001-01-0185
- DieselNet Technical Guide>>Emission Control Catalysts www.DieselNet.com Copyright@EcopointInc.Revision Metallic Catalyst Substrates
- Pfeifer Andreas Krueger Michael “U.S.2007 - Which Way to Go? Possible Technical Solutions” SAE 2003-01-0770
- Blakeman Philip.G. “Performance of NOx Absorber Emissions Control Systems for Diesel Engines” SAE- 2003-01-0045
- Scarnegie Brian “Recent DPF/SCR Results Targeting US2007 and Euro 4/5 HD Emissions” SAE 2003-01-0774
- Nakatsuji Tadao et al. “A catalytic NO reduction in periodic lean and rich excursions over Rh supported on oxygen storage materials” Applied Catalysis B; environmental 38 2002 101 116